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9.0CRITICAL

Exploits Turn Windows Defender into Attacker Tool

📅 21 April 2026 at 19:12 UTC📰 Dark ReadingView original source ↗

Three proof-of-concept exploits are being used in active attacks against Microsoft's built-in security platform; two are unpatched.

🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview

Windows Defender has been compromised by attackers using three proof-of-concept exploits, with two being unpatched, allowing the security platform to be turned into an attacker tool.

⚙️Technical Details
Affected Systems
Microsoft's built-in security platform
Attack Vectors
Three proof-of-concept exploits
💥Impact Assessment
Severity: Critical
Who Is at Risk
Organizations using Microsoft's built-in security platform
🛡️Recommended Actions
1Apply the latest security patches to prevent exploitation of unpatched vulnerabilities.
2Monitor system logs for suspicious activity related to Windows Defender.
3Verify the integrity of Windows Defender by checking its digital signatures.
📦Affected Products
Microsoft's built-in security platform

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